About 3,400 (in addition, 240 were sold in Canada)
This recall involves Denon’s HEOS 1 Go Pack lithium-ion rechargeable battery packs for wireless speakers. Only HEOS 1 Go Packs with a 10-character alpha-numeric serial number beginning with 5 or 601G91 and ending with 3517 through 4004 are included in the recall; the battery packs are black or white, hexagon-shaped and have four blue LED lights and a power button. HEOS, the model and serial numbers are printed on the bottom. Only the speaker battery is being recalled.
Consumers should immediately stop using the recalled battery packs and contact Denon for a free replacement battery pack, including shipping.
Best Buy (Magnolia), Brookstone and online at BestBuy.com and Amazon.com from May 2015 through June 2016 for about $100.
Denon Electronics (USA) LLC, of Mahwah, N.J.